Represents in-memory storage. More...

#include <in-memory-storage.hpp>

Inheritance diagram for ndn::InMemoryStorage:

Collaboration diagram for ndn::InMemoryStorage:

Classes
class	const_iterator
	Represents a self-defined const_iterator for the in-memory storage. More...

class	Error
	Represents an error might be thrown during reduce the current capacity of the in-memory storage through function setCapacity(size_t nMaxPackets). More...

Public Types
typedef boost::multi_index_container< InMemoryStorageEntry *, boost::multi_index::indexed_by< boost::multi_index::ordered_unique< boost::multi_index::tag< byFullName >, boost::multi_index::const_mem_fun< InMemoryStorageEntry, const Name &,&InMemoryStorageEntry::getFullName >, std::less< Name > > > >	Cache

Public Member Functions
	InMemoryStorage (size_t limit=std::numeric_limits< size_t >::max())
	Create a InMemoryStorage with up to `limit` entries The InMemoryStorage created through this method will ignore MustBeFresh in interest processing. More...

	InMemoryStorage (boost::asio::io_service &ioService, size_t limit=std::numeric_limits< size_t >::max())
	Create a InMemoryStorage with up to `limit` entries The InMemoryStorage created through this method will handle MustBeFresh in interest processing. More...

virtual	~InMemoryStorage ()

InMemoryStorage::const_iterator	begin () const
	Returns begin iterator of the in-memory storage ordering by name with digest. More...

InMemoryStorage::const_iterator	end () const
	Returns end iterator of the in-memory storage ordering by name with digest. More...

void	erase (const Name &prefix, const bool isPrefix=true)
	Deletes in-memory storage entry by prefix by default. More...

shared_ptr< const Data >	find (const Interest &interest)
	Finds the best match Data for an Interest. More...

shared_ptr< const Data >	find (const Name &name)
	Finds the best match Data for a Name with or without the implicit digest. More...

size_t	getLimit () const

void	insert (const Data &data, const time::milliseconds &mustBeFreshProcessingWindow=INFINITE_WINDOW)
	Inserts a Data packet. More...

size_t	size () const

Static Public Attributes
static const time::milliseconds	INFINITE_WINDOW

Protected Member Functions
virtual void	afterAccess (InMemoryStorageEntry *entry)
	Update the entry when the entry is returned by the find() function according to derived class implemented replacement policy. More...

virtual void	afterInsert (InMemoryStorageEntry *entry)
	Update the entry or other data structures after a entry is successfully inserted according to derived class implemented replacement policy. More...

virtual void	beforeErase (InMemoryStorageEntry *entry)
	Update the entry or other data structures before a entry is successfully erased according to derived class implemented replacement policy. More...

void	eraseImpl (const Name &name)
	deletes in-memory storage entries by the Name with implicit digest. More...

virtual bool	evictItem ()=0
	Removes one Data packet from in-memory storage based on derived class implemented replacement policy. More...

size_t	getCapacity () const
	returns current capacity of in-memory storage (in packets) More...

bool	isFull () const
	returns true if the in-memory storage uses up the current capacity, false otherwise More...

void	printCache (std::ostream &os) const
	Prints contents of the in-memory storage. More...

void	setCapacity (size_t nMaxPackets)
	sets current capacity of in-memory storage (in packets) More...

Detailed Description

Represents in-memory storage.

Definition at line 41 of file in-memory-storage.hpp.

Member Typedef Documentation

typedef boost::multi_index_container< InMemoryStorageEntry*, boost::multi_index::indexed_by< boost::multi_index::ordered_unique< boost::multi_index::tag<byFullName>, boost::multi_index::const_mem_fun<InMemoryStorageEntry, const Name&, &InMemoryStorageEntry::getFullName>, std::less<Name> > > > ndn::InMemoryStorage::Cache

Definition at line 45 of file in-memory-storage.hpp.

Constructor & Destructor Documentation

ndn::InMemoryStorage::InMemoryStorage ( size_t limit = std::numeric_limits<size_t>::max() )

explicit

Create a InMemoryStorage with up to limit entries The InMemoryStorage created through this method will ignore MustBeFresh in interest processing.

Definition at line 84 of file in-memory-storage.cpp.

ndn::InMemoryStorage::InMemoryStorage	(	boost::asio::io_service &	ioService,
		size_t	limit = `std::numeric_limits<size_t>::max()`
	)

explicit

Create a InMemoryStorage with up to limit entries The InMemoryStorage created through this method will handle MustBeFresh in interest processing.

Definition at line 91 of file in-memory-storage.cpp.

ndn::InMemoryStorage::~InMemoryStorage ( )

virtual

Note: Please make sure to implement it to free m_freeEntries and evict all items in the derived class for anybody who wishes to inherit this class

Definition at line 114 of file in-memory-storage.cpp.

Member Function Documentation

void ndn::InMemoryStorage::afterAccess ( InMemoryStorageEntry * entry )

protectedvirtual

Update the entry when the entry is returned by the find() function according to derived class implemented replacement policy.

Reimplemented in ndn::InMemoryStorageLfu, and ndn::InMemoryStorageLru.

Definition at line 435 of file in-memory-storage.cpp.

void ndn::InMemoryStorage::afterInsert ( InMemoryStorageEntry * entry )

protectedvirtual

Update the entry or other data structures after a entry is successfully inserted according to derived class implemented replacement policy.

Reimplemented in ndn::InMemoryStorageLfu, ndn::InMemoryStorageLru, and ndn::InMemoryStorageFifo.

Definition at line 425 of file in-memory-storage.cpp.

void ndn::InMemoryStorage::beforeErase ( InMemoryStorageEntry * entry )

protectedvirtual

Update the entry or other data structures before a entry is successfully erased according to derived class implemented replacement policy.

Reimplemented in ndn::InMemoryStorageLfu, ndn::InMemoryStorageLru, and ndn::InMemoryStorageFifo.

Definition at line 430 of file in-memory-storage.cpp.

InMemoryStorage::const_iterator ndn::InMemoryStorage::begin ( ) const

Returns begin iterator of the in-memory storage ordering by name with digest.

Returns: { const_iterator pointing to the beginning of the m_cache }

Definition at line 409 of file in-memory-storage.cpp.

InMemoryStorage::const_iterator ndn::InMemoryStorage::end ( ) const

Returns end iterator of the in-memory storage ordering by name with digest.

Returns: { const_iterator pointing to the end of the m_cache }

Definition at line 417 of file in-memory-storage.cpp.

void ndn::InMemoryStorage::erase	(	const Name &	prefix,
		const bool	isPrefix = `true`
	)

Deletes in-memory storage entry by prefix by default.

Parameters

prefix	Exact name of a prefix of the data to remove
isPrefix	If false, the function will only delete the entry completely matched with the prefix according to canonical ordering. For this case, user should substitute the prefix with full name.

Note: Please do not use this function directly in any derived class to erase entry in the cache, use eraseHelper instead.; It will invoke beforeErase(shared_ptr<InMemoryStorageEntry>).

Definition at line 371 of file in-memory-storage.cpp.

void ndn::InMemoryStorage::eraseImpl ( const Name & name )

protected

deletes in-memory storage entries by the Name with implicit digest.

This is the function one should use to erase entry in the cache in derived class. It won't invoke beforeErase(shared_ptr<Entry>).

Definition at line 398 of file in-memory-storage.cpp.

virtual bool ndn::InMemoryStorage::evictItem ( )

protectedpure virtual

Removes one Data packet from in-memory storage based on derived class implemented replacement policy.

Please do not use this function directly in any derived class to erase entry in the cache, use eraseHelper instead.

Returns: { whether the Data was removed }

Implemented in ndn::InMemoryStorageLfu, ndn::InMemoryStorageLru, ndn::InMemoryStorageFifo, and ndn::InMemoryStoragePersistent.

shared_ptr< const Data > ndn::InMemoryStorage::find ( const Interest & interest )

Finds the best match Data for an Interest.

Note: It will invoke afterAccess(shared_ptr<InMemoryStorageEntry>). As currently it is impossible to determine whether a Name contains implicit digest or not, therefore this find function is not able to locate a packet according to an interest( including implicit digest) whose name is not the full name of the data matching the implicit digest.

Returns: { the best match, if any; otherwise a null shared_ptr }

Definition at line 220 of file in-memory-storage.cpp.

shared_ptr< const Data > ndn::InMemoryStorage::find ( const Name & name )

Finds the best match Data for a Name with or without the implicit digest.

If packets with the same name but different digests exist and the Name supplied is the one without implicit digest, a packet will be arbitrarily chosen to return.

Note: It will invoke afterAccess(shared_ptr<InMemoryStorageEntry>).

Returns: { the one matched the Name; otherwise a null shared_ptr }

Definition at line 201 of file in-memory-storage.cpp.

size_t ndn::InMemoryStorage::getCapacity ( ) const

inlineprotected

returns current capacity of in-memory storage (in packets)

Returns: { number of packets that can be stored in application cache }

Definition at line 255 of file in-memory-storage.hpp.

size_t ndn::InMemoryStorage::getLimit ( ) const

inline

Returns: { maximum number of packets that can be allowed to store in in-memory storage }

Definition at line 185 of file in-memory-storage.hpp.

void ndn::InMemoryStorage::insert	(	const Data &	data,
		const time::milliseconds &	mustBeFreshProcessingWindow = `INFINITE_WINDOW`
	)

Inserts a Data packet.

Parameters

data	the packet to insert, must be signed and have wire encoding
mustBeFreshProcessingWindow	Beyond this time period after the data is inserted, the data can only be used to answer interest without MustBeFresh selector.

Note: Packets are considered duplicate if the name with implicit digest matches. The new Data packet with the identical name, but a different payload will be placed in the in-memory storage.; It will invoke afterInsert(shared_ptr<InMemoryStorageEntry>).

Definition at line 161 of file in-memory-storage.cpp.

bool ndn::InMemoryStorage::isFull ( ) const

inlineprotected

returns true if the in-memory storage uses up the current capacity, false otherwise

Definition at line 263 of file in-memory-storage.hpp.

void ndn::InMemoryStorage::printCache ( std::ostream & os ) const

protected

Prints contents of the in-memory storage.

Definition at line 440 of file in-memory-storage.cpp.

void ndn::InMemoryStorage::setCapacity ( size_t nMaxPackets )

protected

sets current capacity of in-memory storage (in packets)

Definition at line 131 of file in-memory-storage.cpp.

size_t ndn::InMemoryStorage::size ( ) const

inline

Returns: { number of packets stored in in-memory storage }

Definition at line 193 of file in-memory-storage.hpp.

Member Data Documentation

const time::milliseconds ndn::InMemoryStorage::INFINITE_WINDOW

static

Definition at line 320 of file in-memory-storage.hpp.

ndn-cxx: NDN C++ library with eXperimental eXtensions 0.6.0 documentation

Classes

Public Types

Public Member Functions

Static Public Attributes

Protected Member Functions

Detailed Description

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation